Ore-crushing stamp-mill



(No Model.)

2 Sheets-Sheet 1 O. H. BAKER..

ORE GRUSHINGST-AMP MILL.

Patented Sept. 13, 1881.

t 1 *i i Wit'nesaes (No Model.) 2 -Sheets-'Sheet 2.

0. H. BAKER. ORE GRUSHING STAMP'MILL. No. 246,935, Patented Slept. 13,1881.

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N. PETERS, Fhowuuw mnher, wnznm lon, D. C.

PATENT OFFICE.

CHARLES H. BAKER, OF SAN FRANCISCO, CALIFORNIA.

ORE-CRUSHING STAMP-MILL.

SPECIFICATION forming part of Letters Patent No. 246,935, dated September 13, 1881.

Application filed December 22, 1880. (No model.)

To all whom 'it may concern:

Be it known that I, CHARLES H. BAKER, of the city and county of San Francisco, State of California, have invented. an Improved Ore- Crushing Stamp-Mill; and I hereby declare the following to be a full, clear, and exact description thereof.

Myinvention relates to certain improvements in the construction of ore-crushing stamp-mills, by which I am enabled to so condense the mill in size that I have double the capacity, while occupying but little more space than a single mill. One feeding apparatus serves to supply the double set of stamps, and the frame-work is made of iron, so that the whole mill may be completed and shipped to any point, and the great expense of frame-timbers is avoided in places where timber is scarce or inaccessible.

My invention consists in the combination of a double mortar, or two mortars set back to back, upon a single foundation, so that the pulp may be delivered through screens upon both sides. A frame -work of iron supports two short parallel shafts, which are so placed, one above the other, as to allow the cams upon each to revolve without striking the other shaft, and the cams themselves so keyed upon their respective shafts as not to interfere with each other, this construction enabling me to build a ten-stamp mill within the space usually occupied by a five-stamp mill.

Referring to the accompanying drawings for a more complete explanation of my invention, Figure 1 is a perspective view. Fig. 2 is a horizontal section. Fig. 3 shows the arrangement of the cams.

In the construction of stamp-mills they are usually built in batteries of five stamps, which operate within a cast-iron mortar having dies, upon which the stamps fall and crush the ore which is fed in from time to time. Suitable screens allow the pulp to escape when fine enough. The stamps are lifted by cams upon a horizontal cam-shaft above, these cams engaging with tappets upon the stamp-stems for this purpose in the well-known manner. When, however, a mill is to be increased in size, itis done by simply adding as many of these fivestamp batteries as may be desired, and they are usually extended in a line. This makes it necessary to employlon g heavy cam-shafts and counter-shafts, and a strong heavy frame-Work of wood is always necessary to support these parts and keep them in line. The foundation must also be made solid and heavy, and when extended is very expensive.

In my invention I concentrate a ten-stamp mill upon the foundation necessary for a five-. stamp mill, and by my combination of mortars, iron frame-work, and shortparallel cam-shafts I make the mill without any cumbersome parts, and it may be easily transported into places difficult of access.

Let Arepresent one mortar, and B another, each containing five stamps, C, with corresponding dies D, said stamps having the usual shoes, E, capable of being removed for repairs or the substitution of others when worn out. The stamps are attached in the usual manner to stems F, having tappets G above, as shown. The cam-sh afts of each may be represented by H, to which are attached the cams K, so arranged as to raise the tappets G one after another, in the ordinary well-known manner.

The mortars A and B are placed upon a common foundation, L, and clamped together by the bolts U back to back, with their respective cam-shafts H,having their driving-wheels I on opposite sides, as shown, and their sieves or screens J likewise oppositely placed, so that the pulverized-ore will be discharged from both sides. The mortar B has its cam-shaft H set a little lower than the cam-shaft of the mortar A, so that its cams K will not strike against the cam-shaft of A. On the cam-shaft A the cams K are, keyed from one-side and lift their tappets Grifrom that side of the stems F,while the cams o t' 'the cam-shaft H of the mortar B- are keyed on from the opposite side and raise their tappets Gfrom the other side of the stems F, so that neither set of cams will interfere with the other,but revolve between each other, those of the mortar B being a littlelower than those of A.

Let P represent the outside framework. It consists of four upright pieces of angle-iron, secured at their lower ends to the foundation L. The edges or corners of the foundation L are squared, so that the ends of the angle irons P fit over them and are bolted through from both sides, as shown. A cast-iron step, 0, is riveted onto the angle-iron, as shown, and rests upon the corners of the foundation-block L, supporting the weight; of the pillars I. The tops of said pillars of angle-iron P are joined together by a square top or cap of iron, '1. They are thus simply and strongly bound together above and below, and cannot get out of line. They can be madelighter than the present form of heavy wooden frame supporting batteries in line, because they are thus hugged together and do not receive all the strain, be ing relieved of a portion of it by reason of the position of the two mortarspvhich serve to support each other.

The guide-timbers B, through which the stems F pass in stamp-mills, can be secured to my frame P by being supported between the pillars of angle-iron by the pieces or strips of iron S, as shown. These strips S further brace the outside frame, 1?.

The ore is supplied to the mortars from the feeder M through the spouts H H, the one spout leading to the mortar A between the stems, and the other leading to mortar B, as shown in Fig. 1.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-- v The frame-work consisting of the four upright angle-iron pillars P, with their steps 0, for resting upon the foundation-block L, and havin g theirlower ends bolted to the said block L, and their upper ends joined together by the cap T, said frame having the parallel journalsupporting timbers for the cam-shafts lyingin different planes, and the double stem-guides, whereby a double combination mill is formed, substantially as herein described.

In witness whereof It have hereunto set my hand.

CHARLES H. BAKE R.

Witnesses:

FRANK A. BROOKS, JNo. L. OoNDRoN. 

